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Borrowings - Narrative (Details) |  |  | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
May 31, 2019 USD ($) | Jun. 23, 2015 USD ($) | Sep. 30, 2019 USD ($) covenant | Dec. 31, 2018 | Jun. 13, 2016 USD ($)
Line of Credit Facility [Line Items] |  |  |  |  |
Number of financial covenants | covenant |  |  | 2 |  |
For 12 Months in Connection with Certain Acquisitions |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Leverage ratio |  |  | 4.00 |  |
Minimum |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Required percent for prepayment amount of aggregate principal amount |  |  |  |  | 5.00%
Interest coverage ratio |  |  | 3.00 |  |
Maximum |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Leverage ratio |  |  | 3.50 |  |
Revolving Facility |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt instrument, term |  | 5 years |  |  |
Borrowing capacity | $ 800,000,000 | $ 700,000,000 |  |  |
Extension period | 1 year |  |  |  |
Aggregate lending commitments | $ 400,000,000 |  |  |  |
Current borrowings under revolving facility |  |  | $ 0 |  |
Outstanding letters of credit |  |  | 10,100,000 |  |
Amount available to borrow |  |  | $ 789,900,000 |  |
3.20% Senior Notes, due June 2023 |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Stated interest rate |  |  | 3.20% | 3.20% |
3.37% Senior Notes, due June 2025 |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Stated interest rate |  |  | 3.37% | 3.37% |
4.50% Senior Notes, due December 2020 |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Stated interest rate |  |  | 4.50% | 4.50% |
4.20% Senior Notes, due December 2021 |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Stated interest rate |  |  | 4.20% | 4.20% |
Senior Notes | Maximum |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Limitation of outstanding principal of higher preference debt as percent of consolidated assets |  |  | 15.00% |  |
Senior Notes | 3.20% Senior Notes, due June 2023 |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Face amount of debt |  |  |  |  | $ 100,000,000
Stated interest rate |  |  |  |  | 3.20%
Senior Notes | 3.37% Senior Notes, due June 2025 |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Face amount of debt |  |  |  |  | $ 100,000,000
Stated interest rate |  |  |  |  | 3.37%
Letters Of Credit | Revolving Facility |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Borrowing capacity | 75,000,000 |  |  |  |
Swing line Loans | Revolving Facility |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Borrowing capacity | $ 50,000,000 |  |  |  |

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 + Details
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- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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